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Re: [Xen-devel] [PATCH V3 05/10] xen/arm: vgic: Use dynamic memory allocation for vgic_rdist_region
Hi Shanker,
On 27/06/16 21:33, Shanker Donthineni wrote:
The number of Redistributor regions allowed for dom0 is hardcoded
to a define MAX_RDIST_COUNT which is 4. Some systems, especially
latest server chips, may have more than 4 redistributors. Either we
have to increase MAX_RDIST_COUNT to a bigger number or allocate
memory based on the number of redistributors that are found in MADT
table. In the worst case scenario, the macro MAX_RDIST_COUNT should
be equal to CONFIG_NR_CPUS in order to support per CPU Redistributors.
Increasing MAX_RDIST_COUNT has a effect, it blows 'struct domain'
size and hits BUILD_BUG_ON() in domain build code path.
struct domain *alloc_domain_struct(void)
{
struct domain *d;
BUILD_BUG_ON(sizeof(*d) > PAGE_SIZE);
d = alloc_xenheap_pages(0, 0);
if ( d == NULL )
return NULL;
...
This patch uses the second approach to fix the BUILD_BUG().
Signed-off-by: Shanker Donthineni <shankerd@xxxxxxxxxxxxxx>
Reviewed-by: Julien Grall <julien.grall@xxxxxxx>
Regards,
--
Julien Grall
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